Sizzling heat is not shown in the chart at left. The metal stiffens as it cools down and cannot be worked as easily when it cools to lower temperatures. A good rule of thumb for most shaping of mild steel and wrought iron is to work it when heated yellow, and put it back in the fire when it cools to red.
UIO redirects here. For other uses, see UIO (disambiguation). Mariscal Sucre International Airport (Spanish: Aeropuerto Internacional Mariscal Sucre) (IATA: UIO, ICAO: SEQM) is the busiest airport in Ecuador and one of the busiest airports in South America.
Orlando International Airport. For the other international airport serving the Orlando area, see Orlando Sanford International Airport. Orlando International Airport (IATA: MCO, ICAO: KMCO, FAA LID: MCO) is a major public airport located six miles southeast of Orlando, Florida, United States. It is the second-busiest airport in the state of Florida, as over 40.2 million passengers were handled at the airport as of 2015.